Thanks to Falko for the great tutorial. I have used it a few times, and it has helped me as a newbie to get an idea of what to do. That said, I'm not a Linux guru by any stretch of the imagination. I can do some basic things, but I don't know the ins and outs like you guys. After doing it recently on a brand new box, I've come across two issues: 1) My mail server is open to relaying. When I login and "telnet localhost 25", I walk through the commands to set the from, to, and data, and it all goes through. It should tell me that relaying is disabled. I've Google'd it, but I can't find a definitive answer. Any ideas on where to look? I tried updating the relayhosts variable to several things, but to no avail. 2) Mail won't send When I send a message, I get the following message in my maillog: Code: status=deferred (Host or domain name not found. Name service error for name=domain.com type=MX: Host not found, try again) I can nslookup the domain fine. It also appears the Internet is fine, as yum installs, and I can copy files across the network. Any help would be appreciated.